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Which cryptanalytic attack is described in the following statement? The attacker first attempts to brute force plaintext and cipher text of a block cipher. He then encrypts known plaintext with various keys on one end while decrypting cipher text with various keys on the other end, trying to get a matching result: text encrypted with one key.
Man in the middle attack
Replay attack
Known plaintext attack
Meet in the middle attack
The correct response is a meet in the middle attack. The attacker "meets in the middle" of the block cipher if getting a match of encrypted plaintext with decrypted cipher text. Such attack helps reducing time when decrypting text encrypted with more than one key.
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